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The longer I think about it, the more I suspect that isolation of the VLANs doesn't work with non-802.1Q port VLANs for the same reason why it also doesn't work for the TL-SG108E/TL-SG105E: there is a the default VLAN 1 all ports are always member of it (see the threads in the "Easy Smart Switch" section about port VLAN not isolating clients due to the fact that VLAN 1 can't be removed from the ports of those switches).

Of course the 802.1Q VALN cannot work with the port VLAN function in ER Router.The mechanism of 802.1Q is according to the VLAN tag added in the packets while the port VLAN has no relationship with the Tag.

I want to know how can he get different subnets with this switch TL-SG108PE. As I known, this easy smart switch cannot config the VLAN Interface.

It all depends on the way the TL-ER604W handles VLANs. Since the user guide is not very helpful at all in respect to VLAN support of this router and since the TL-ER604W itself is missing the feature to add logical interfaces for VLANs, you have to try out which scheme works. There are 3 possible schemes and 4 plans:

Plan A: follow the manual. Set up static routes to the IPs of the clients for routing instead of routes to logical VLAN interfaces of the switch.

Plan B: assign two VLANs to two LAN ports of TL-ER604W, connect two ports of the Easy Smart switch with two cables to it and use port VLANs on the switch to separate logical networks.

Plan C: assign no VLANs to LAN ports of TL-ER604W, connect one of its ports to Easy Smart switch port 1, create 3 VLANs (3, 4, 5), assign port 1 to all those VLANs and the other ports either to VLAN 3 or VLAN 4.

Plan D: RMA the TL-SG108 and try a T1, T2 or T3 model instead which has L2+ or L3 capabilities.

It's a pity that owners of TL-ER604W have to find out this by trial and error.

It's a pity that owners of TL-ER604W have to find out this by trial and error.

That is a pity, especially when I am trying to learn how to work with vlans. not the best scenario, but thank you guys so much for your info. I will get back to it and test out the different options that you have provided and hopefully report back with some good news